Discovery vitality not refunding incorrect debit order amount.

I am in my free trial period and they debited my account. i logged a call the day after the debit order which was the 1st of February. To date i have not had any feedback and keep getting passed from pillar to post on who is responsible and when it will get refunded. the next debit order is coming up and i am convinced they will debit me again. *****ing my money and doing NOTHING to resolve it!